This 4WD Smart Robot Car Chassis Kits can be a perfect DIY kit for
you20 line Speed Encoder, more accurate than 6 or 10 one.The mechanical structure is simple, convenient installation.The height between two chassis can be change by different copper
pillar.The four turn speed dc motor flexible, directional well. Quad,
chronological horsepower. Chassis and stability is very easy to
extend.The car comes with speed encoder, cooperate with our speed of
photoelectric, can rapidly form a speed measuring system. Can
speed, range, form a closed loop system.The car can be added four L293D motor driver module, four-way
tracing module, and 51 control unit seamless docking, with red
light expanded hole of obstacle avoidance so that making this
composition system concise and good-looking.